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Minimal test - lines (51, 115)

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inline nsresult nsresultForErrno(int aErr) {
  switch (aErr) {
    case 0:
      return NS_OK;
#ifdef EDQUOT
    case EDQUOT: /* Quota exceeded */
                 // FALLTHROUGH to return NS_ERROR_FILE_DISK_FULL
#endif
    case ENOSPC:
      return NS_ERROR_FILE_DISK_FULL;
#ifdef EISDIR
    case EISDIR: /*      Is a directory. */
      return NS_ERROR_FILE_IS_DIRECTORY;
#endif
    case ENAMETOOLONG:
      return NS_ERROR_FILE_NAME_TOO_LONG;
    case ENOEXEC: /*     Executable file format error. */
      return NS_ERROR_FILE_EXECUTION_FAILED;
    case ENOENT:
      return NS_ERROR_FILE_TARGET_DOES_NOT_EXIST;
    case ENOTDIR:
      return NS_ERROR_FILE_DESTINATION_NOT_DIR;
#ifdef ELOOP
    case ELOOP:
      return NS_ERROR_FILE_UNRESOLVABLE_SYMLINK;
#endif /* ELOOP */
#ifdef ENOLINK
    case ENOLINK:
      return NS_ERROR_FILE_UNRESOLVABLE_SYMLINK;
#endif /* ENOLINK */
    case EEXIST:
      return NS_ERROR_FILE_ALREADY_EXISTS;
#ifdef EPERM
    case EPERM:
#endif /* EPERM */
    case EACCES:
      return NS_ERROR_FILE_ACCESS_DENIED;
#ifdef EROFS
    case EROFS: /*     Read-only file system. */
      return NS_ERROR_FILE_READ_ONLY;
#endif
      /*
       * On AIX 4.3, ENOTEMPTY is defined as EEXIST,
       * so there can't be cases for both without
       * preprocessing.
       */
#if ENOTEMPTY != EEXIST
    case ENOTEMPTY:
      return NS_ERROR_FILE_DIR_NOT_EMPTY;
#endif /* ENOTEMPTY != EEXIST */
    /* Note that nsIFile.createUnique() returns
       NS_ERROR_FILE_TOO_BIG when it cannot create a temporary
       file with a unique filename.
       See https://developer.mozilla.org/en-US/docs/Table_Of_Errors
       Other usages of NS_ERROR_FILE_TOO_BIG in the source tree
       are in line with the POSIX semantics of EFBIG.
       So this is a reasonably good approximation.
    */
    case EFBIG: /*     File too large. */
      return NS_ERROR_FILE_TOO_BIG;

    default:
      return NS_ERROR_FAILURE;
  }
}